﻿using System;
using System.Globalization;
using System.Windows.Data;

namespace TheKitchen.Client.Converter
{
    /// <summary>
    /// Converts the 0..1 value of a Rating control from the Silverlight Control Toolkit into a normal integer.
    /// </summary>
    /// <remarks>
    /// Supports one parameter, which is the range for the property in the binding source.
    /// </remarks>
    public class RatingConverter : IValueConverter
    {
        /// <summary>
        /// Modifies the source data before passing it to the target for display in the UI.
        /// </summary>
        /// <returns>
        /// The value to be passed to the target dependency property.
        /// </returns>
        /// <param name="value">The source data being passed to the target.</param><param name="targetType">The <see cref="T:System.Type"/> of data expected by the target dependency property.</param><param name="parameter">An optional parameter to be used in the converter logic.</param><param name="culture">The culture of the conversion.</param>
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            int factor = System.Convert.ToInt32(parameter);
            double typedValue = System.Convert.ToDouble(value);

            return typedValue / factor;
        }

        /// <summary>
        /// Modifies the target data before passing it to the source object.  This method is called only in <see cref="F:System.Windows.Data.BindingMode.TwoWay"/> bindings.
        /// </summary>
        /// <returns>
        /// The value to be passed to the source object.
        /// </returns>
        /// <param name="value">The target data being passed to the source.</param><param name="targetType">The <see cref="T:System.Type"/> of data expected by the source object.</param><param name="parameter">An optional parameter to be used in the converter logic.</param><param name="culture">The culture of the conversion.</param>
        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            int factor = System.Convert.ToInt32(parameter);
            double typedValue = System.Convert.ToDouble(value);

            return typedValue * factor;
        }
    }
}
